An estimated 15,750 of those are expected to use the four park and ride sites, while 5,000 will travel by rail.
The remaining 4,250 will head to the venue by coach, taxi, local bus, foot, cycle or on the river.
London 2012 rowing will run from Saturday until Saturday, August 4, with canoe sprint events from Monday, August 6 until Saturday, August 11.
Competitions will start no earlier than 9.30am and finish no later than 2.20pm.
Park and ride
The four park and ride sites have a combined total of 5,378 spaces and can cater for up to 16,350 spectators.
Windsor Great Park - 2,008 spaces, 6,100 spectators. Opening time not yet confirmed, closes 9pm.
Braywick Park, Maidenhead - 790 spaces, 2,400 spectators. Opening time not yet confirmed, closes 9pm.
Stafferton Way, Maidenhead - 601 spaces, 1,850 spectators. Opening and closing times not yet confirmed.
Upton Court Park, Slough - 1,979 spaces, 6,000 spectators. Open 5am-7pm.
Spectators are encouraged to travel to Slough, Maidenhead or Windsor & Eton Riverside stations.
First Great Western run services to Slough and Maidenhead between London Paddington and the west of England, while South West Trains run services from London Waterloo.
Weekdays arrivals by 8am - 41 trains, more than 20,000 spectators.
Saturday arrivals by 8am - 23 trains, 15,000 spectators.
Sunday arrivals by 8am - nine trains, 5,000 spectators.
The free spectator Games Travelcard can be used to travel by National Rail between London and Slough or Windsor & Eton Riverside.
Free shuttle buses will run from each station to the venue every two to four minutes during peak times and every 20 minutes during the rest of the day.
Royal Borough residents can use the shuttle buses on production of their Games tickets.
Free accessible shuttles will run from each railway station to a drop-off point outside the venue entrance every 20 minutes, from two hours before the start of the event and until two hours after the end.
All stations have step-free access with staff assistance available.
Free Blue Badge parking will be available but must be pre-booked.
Charter coach parking
Windsor Racecourse - 25 spaces, 1,250 passengers.
Taxi and private hire
Windsor Racecourse - 57 spaces for taxi rank and private hire vehicles.
Windsor Promenade to Windsor Racecourse - French Brothers service every 15 minutes during the day, with capacity for 400 spectators per hour.
Walking and cycling
The Games Walk arts trail project has been installed along the north bank of the Thames from Eton to the venue.
There will be led walks from the Boveney exit gate along the north bank most days of the Games.
There will also be led rides from Maidenhead railway station to Big Meadow, with parking space for 600 cycles.
A route from Maidenhead town centre runs along Green Lane to Hibbert Road and into Bray, where cyclists have been given an exemption to the No Entry restriction between Ferry Road and Old Mill Lane.
There will also be a signed pedestrian route from Windsor & Eton Riverside railway station.
Click the following link to download the below map.
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The Met Office has issued a yellow alert for Windsor and Maidenhead, Slough and Wokingham, warning that rain moving eastwards across the south of the country may turn to snow in some places.